String literals a, b, c...

字符串字面值，比如a、b、c等等。

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Insufficient amounts of vitamins A, B, C, and E can result in hair loss.

维生素A，B，C和E的缺乏会导致掉发。

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Answer the questions after each text by choosing A, B, C or D.

超出答题区域书写的答案无效；

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Answer the questions after each text by choosing A, B, C or D.

超出答题区域书写的答案无效；

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